大学生社团信息管理系统

JLabel imagLabel=new JLabel(background); this.setSize(800, 600);//设置大小

this.setLocationRelativeTo(null);//放在屏幕中间 this.setResizable(false);//不可改变大小

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置关闭属性 Container cont=this.getContentPane(); cont.setLayout(null);//自定义布局

lbTip.setFont(new Font(\黑体\lbTip.setForeground(Color.BLUE); lbTip.setBounds(0, 30, 800, 100); cont.add(lbTip);

lbUsername.setBounds(150, 200, 100, 25);

lbUsername.setFont(new Font(\宋体\txtUsername.setBounds(280, 200, 250, 28); cont.add(lbUsername); cont.add(txtUsername);

lbPassword.setBounds(150, 290, 100, 25);

lbPassword.setFont(new Font(\宋体\txtPassword.setBounds(280, 290, 250, 28); cont.add(lbPassword); cont.add(txtPassword);

btnLogin.setBounds(210, 380, 80, 25); btnCancel.setBounds(400, 380, 80, 25);

btnLogin.addActionListener(new LoginAction()); btnLogin.setFont(new Font(\宋体\btnCancel.addActionListener(new CancelAction()); btnCancel.setFont(new Font(\宋体\cont.add(btnLogin); cont.add(btnCancel);

9

}

this.getLayeredPane().add(imagLabel,newInteger(Integer.MIN_VALUE)); }

public static User getMainUser() { }

public static void setMainUser(User mainUser) { }

public static void main(String[] args) { }

new LoginFrame();

LoginFrame.mainUser = mainUser; return mainUser;

imagLabel.setBounds(0, 0, this.getWidth(), this.getHeight()); cont.add(imagLabel);

this.setVisible(true); //可见性

4.3登录模块实现过程

登录窗口设计十分简单，有一个用户名文本框，一个密码文本框，一个登录按钮和一个取消按钮组成。下面将实现介绍登录模块的实现过程。

（1）实现用户登录操作的数据表是user，首先创建与数据表对应的JaveBeen类User，该类中属性与数据表中字段一一对应，并包含了属性的get与set方法，具体代码如下：

package com.zky.www.model; public class User {//javabean

private int userId; private String username; private String password;

public User(int userId, String username, String password) {

super();

this.userId = userId;

10

}

}

this.username = username; this.password = password;

public User(String username, String password) { }

public User() { }

public int getUserId() { }

public void setUserId(int userId) { }

public String getUsername() { }

public void setUsername(String username) { }

public String getPassword() { }

public void setPassword(String password) { }

11

super();

this.username = username; this.password = password;

super();

return userId;

this.userId = userId;

return username;

this.username = username;

return password;

this.password = password;

（2）定义类UserDao，在该类中实现按用户名与密码查询用户的方法getUser（），该方法的返回值为User对象。具体代码如下：

package com.zky.www.dao; public class UserDao {

public User checkLogin(Connection conn,User user) { }

public int modifyPassword(Connection conn, User passUser) {

int flag=-1;

String sql=\try{

PreparedStatement pstmt=conn.prepareStatement(sql);

12

User resultUser=null;

String sql=\try {

PreparedStatement pstmt=conn.prepareStatement(sql); pstmt.setString(1, user.getUsername()); pstmt.setString(2,user.getPassword()); ResultSet rs=pstmt.executeQuery(); if(rs.next()){ }

resultUser=new User();

resultUser.setUserId(rs.getInt(\resultUser.setUsername(rs.getString(\resultUser.setPassword(rs.getString(\

} catch (SQLException e) { }

return resultUser;

e.printStackTrace();